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Only valid if your real visitor's first visit's pages per session is >2 otherwise when it's under <2 then first time visitors will never properly utilise browser caching or other caching layers.

For me 1st time visitors have ~1.5 pages/session average while return visitors have ~3.5-5.0 pages/session average. Where 80% of visitors are 1st time visitors, it means majority of visitors won't make optimal use of any browser cache and/or caching layers so optimal 1st time visitor metrics are important.

Here's Webpagetest same forum index with same 3G fast Chrome speed profile testing 1st, 2nd and 3rd time visitors to measure browser cache and cloudflare caching effectiveness. Yes LCP and page load time improved but for css.php the 1st visit the css time was still high (mark_cs_s - mark_cs_e = 2.670s - 1.0.17s = 1.653s). Cached 2nd and 3rd visits was fast at 0.013s to 0.056s.

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